Duplex wrench



Feb. 24, 1 931. E N B 1,793,714

DUPLEX WRENCH Filed April 14, 1928 Patented Feb. 24, 1931 Nrrsn stares PAT T? FQL E F F l EMIL NEWBERG, or naocn'ron, mssacnusnrrs DUPLEX me e Application filed April 14,

This invention relates to a wrench co1n posed of a shank and heads formed on op- 10 hand to turn a nu Heretofore in a Wrench of this character the sides of each head have been parallel with those of the other head, the side being in common planes. l/Vhen the exposed head is edgewise to the palm and fingers of the hand, so that the only bearings presented by the grasped head to the palm and. lingers are the relatively narrow edges of saidhead. These edges indent and cause uncomfortable and sometimes injurious pressure on the palm and fingers, liable to cause callouses and sores when the wrench is frequently grasped by the same hand.

The chief object of the invention is to obviate the above-mentioned lability and enable the user to manipulate the wrench without discomfort. 7

Other objects will hereinafter appear.

Of the accompanyingdrawings forming a part of this specification,-

Figure 1 is a side view of a duplex wrench embodying the invention.

Figure 2 is a side view of the head, an edge view of which is shown by Figure 1.

Figure 3 shows in perspective the wrench shown by Figures 1 and 2, and a hand partly closed on the same.

The same reference characters indicate the sameparts in all of the figures.

In the drawings, 12 designates the shank, and 13, 14 the heads formed on opposite ends of the shank. Each head has substantially flat and parallel sides, and an opening 15, extending through the sides, edges of said open- 7 ing forming nut-engaging jaws. The form of each head is such that it is adapted to be grasped by a hand of the user, to manipulate the wrench, the length of the wrench being in position relative to the grasping hand to properly turn a nut, the grasped head'stands s es; Serial No.j270,1 (l 5.

suchithat-theothef head is exposed. The opt- .erative position ofthe exposed head relative to the grasping hand should be such in any Wrench of this character that the walls oft-he opening 15 in the exposed head may lee-conveniently applied toa nut, andthe wrench may be caused to turn the nut by a swinging movement of the hand and wrench in a direction at right angles to the axis of the nut. The shank-is oblong in cross section and has rela-' tively wide sides andnarrow-edges. i

A wrench which includes theshank-and heads characterized as above stated, is in corn-- mon use, the sides of each head being in the same planes with the sides of the other head, so that when the exposed head is in the "prop er position relative to the hand, the grasped head causes uncomfortable pressure on the palm and fingers of thehand."

My invention is characterized that theshank is twisted to locate the sides of one head substantially at right angles to those of the other, substantially a quarter twist being imparted to the shank, as best shown by Figure 1, said twist providing winding bearings for digits of an operating hand pinching the shank adjacent a head, as inclicated by Figure 8. The arrangement is such that when the portion including the winding bearings is pinched as shown, the palm of the operating hand bears on a flat side of one head, and is enabled to advantageously exert pressure thereon, causing the head adjacent the pinched portion and-proj ecting from the hand, to turn a nut with which it is engaged. 8

By advantageously I mean that pressure exerted by the palm on the flat side of a head 'dbes not cause discomfort to the operator, and

. is not liable, when often repeated, to cause a sore or a callous on the palm. The operator is therefore enabled to press harder on the wrench and exert greater turning force on the nut than he could if obliged to exert pressure on a narrow edge face of a head as heretofbre. V

The form of the wrench characterized as above stated is such that the exposed head is held in proper position relative to the hand to turn a nut with which it is engaged when a by the fact '1, ill) swinging movement is imparted to the wrench. V V V The descrlbed relatlve arrangement of the heads is preferably accomplished by first making the wrench in the usual form, the

7 sides of each head being parallel withthose of the other, and the sides of the shank sub; stantially flat and then twisting the shank until the sides of one head are substantially at right angles with those of the other, as shown by Figures 1 and 3.

It is to be understood that when the wrench is in use, the fingers are closedon the shank and the grasped head more fully than as shown by Figure 3, this figure being intended to-illustrate the bearing of the inner side of the grasped head on thepalm. I claim: A duplex wrench comprising a shank and two flat-sidednut-engagingheads formed on opposite ends thereof, the shank being twisted to locate the sides of one head substantially at right angles to those of the other and provide the shank with winding bearings 'for digits of an operating hand pinching the shank adjacentione of the headsQthe arrangement being such that when the shank is thus pinched, the palm of the handbearson the,

flat side of the other head and is enabled to advantageously exert pressure thereon, causing the head adjacent the pinched portion to i turn a nut with which itis engaged. v I 7 In testimony whereof I have afiixed my EMIL i IEwBERG.

signature. 

